Keen Smell. The thurs has advantage on Wisdom (Perception) checks that rely on smell.
False Appearance. The cait sith is indistinguishable from a mundane black cat.
Host Dependent. If the cait sith is not bonded to a living creature, it cannot use its Innate Spellcasting or Bad Luck reaction. A cait sith can become bonded to a creature if invited into its home or summoned as a familiar.
Innate Spellcasting (Glamour). The cait sith’s innate spellcasting ability is Charisma (spell save DC 13, though if acting as a familiar it can use its master’s spell save DC). It can innately cast the following spells, requiring no material components:
• 1/day: bane, bestow curse.
Parasitic Familiar. If the find familiar spell is cast within 10 miles of the cait sith’s location, the cait sith immediately becomes aware of it and can use a reaction to attempt to make itself the subject
of the spell. The caster must succeed on a DC 13 saving throw using its spell attack roll or summon the cait sith instead of the intended familiar.
Once the cait sith has been summoned as a familiar it cannot be dismissed by its master unless it allows it, nor is it obligated to obey its master. If its master tries recasting find familiar, even if the cait sith is dead, the spell will simply summon the cait sith again. The cait sith’s bond to its summoner can be broken with a remove curse spell of 5th level or higher, with the death of its summoner, or as a free action by the cait sith.
Claw. Melee Weapon Attack: +1 to hit, reach 5 ft., one creature. Hit: 1 slashing damage.
Bad Luck.The cait sith imposes disadvantage on one saving throw, ability check, or attack roll being made by a creature within 60 feet of it that it can see.
Description
The cait sith, also known as a midnight cat, appears to simply be a mundane black cat with an immaculate coat and striking green eyes. However, it is in actuality a sinister, intelligent creature that spreads bad luck and misfortune wherever it goes. Displaying a unique form of arcane parasitism, a cait sith must bond itself to a host in order to use its powers.
Born of Longing. Cait sith are born from the souls of mortals who fall hopelessly in love with a fey who, after growing tired of their mortal plaything, blithely toss them aside. The longing that is born in the mortal’s soul begins
to twist their soul, filling them with bitterness towards the happiness of others, until they are eventually transformed into a cait sith, forever longing for companionship but unable to resist their malevolent urges. These creatures can only find a modicum of acceptance in the communities of the very fey who tossed them aside, acting as secret agents to spread misfortune on the behalf of their dark masters.
Inviting it In. A cait sith can only use its magic to cause misfortune while bonded to a creature. A cait sith can only bond to a creature that voluntarily invites it into its home
or summons it as a familiar. As a result, there are many folk tales throughout Ravenloft about why black cats are bad luck, and why you should not invite them into your home.
Parasitic Familiar. When a spellcaster attempts to summon a familiar near a cait sith, it can attempt to force
its way into the spell, causing itself to be summoned instead of the intended target. Once summoned, it is under no compunction to obey its master. Instead, it enjoys itself
by creating misfortune for every creature it encounters. It enjoys tormenting its master by causing misfortune to both it and its allies.
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